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Times Tables · Lesson 8 of 12

8 Times Table

Multiplying by eight is doubling three times. The last digits fall 8, 6, 4, 2, 0, and each fact is ten times the number minus two times it.

What you will learn

  • Say and write the answers in the 88 times table up to 8×128 \times 12.
  • Use the patterns in the table to check your answers.
  • Use the table to solve simple word problems.

Before you start: you should know multiplication as equal groups. See Multiplication: Equal Groups and Arrays.

The idea

The 88 times table lists 88 multiplied by 1,2,31, 2, 3 and so on up to 1212. Each answer is the number of objects in that many groups of 88.

The whole table

12 by 12 multiplication grid, 8 times table highlightedA grid of products from 1 × 1 to 12 × 12. Row and column headings are the numbers being multiplied, and the 8 times table row and column are shaded.×123456789101112112345678910111222468101214161820222433691215182124273033364481216202428323640444855101520253035404550556066121824303642485460667277142128354249566370778488162432404856647280889699182736455463728190991081010203040506070809010011012011112233445566778899110121132121224364860728496108120132144
The 12 by 12 multiplication grid with the 8 times table shaded. Read along the shaded row for 8 × 1 up to 8 × 12.

Patterns

  • Double three times: 8×68 \times 6 is double 6=126 = 12, then 2424, then 4848.
  • Ten times minus two times: 8×78 \times 7 is 70−14=5670 - 14 = 56.
  • The answers are 8,16,24,32,40,48,56,64,72,80,88,968, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, 96.
  • The last digits count down in twos: 8,6,4,2,08, 6, 4, 2, 0 and then repeat.

Skip counting

Counting in steps of 88 gives the answers one after another.

Number line from 0 to 48Number line from 0 to 48. Jumps: from 0 to 8 (+8), from 8 to 16 (+8), from 16 to 24 (+8), from 24 to 32 (+8), from 32 to 40 (+8), from 40 to 48 (+8).081624324048+8+8+8+8+8+8
Six jumps of 8 from zero land on 8, 16, 24, 32, 40 and 48, the first six answers in the table.

An array

An array shows the same facts as rows and columns.

Array of 4 rows of 84 rows with 8 counters in each row, 32 counters in all.
4 rows of 8. 4 × 8 = 32. Turn it on its side to see 8 × 4.

Worked examples

Example 1: Triple double

What is 8×58 \times 5?

  1. Double 55 is 1010, double 1010 is 2020, double 2020 is 4040.

Answer: 4040.

Example 2: Ten minus two

What is 8×98 \times 9?

  1. 10×9=9010 \times 9 = 90.
  2. 2×9=182 \times 9 = 18.
  3. 90−18=7290 - 18 = 72.

Answer: 7272.

Example 3: Spiders

How many legs do 66 spiders have?

  1. A spider has 88 legs.
  2. 6×8=486 \times 8 = 48: use 5×8=405 \times 8 = 40 plus 88.

Answer: 4848 legs.

Eight is two more away from ten. For any number times 88, work out ten times it and take away two times it.

Why it matters

Eights show up in octagons, in the 8 bits in a byte, and in the number of legs on an octopus. The doubling and subtraction tricks work for other tables too.

Practice

Your turn. Type or choose an answer, then press Check. Getting one wrong is fine, that is what practice is for. You can try as many times as you like.

Question 1 of 8

What is 8×38 \times 3?

Question 2 of 8

What is 8×68 \times 6?

Question 3 of 8

What is 8×88 \times 8?

Question 4 of 8

What is 7×87 \times 8?

Question 5 of 8

What is 8×88 \times 8?

Question 6 of 8

What is 8×128 \times 12?

Question 7 of 8

How many sides do 77 octagons have in total?

Question 8 of 8

Which of these is in the 88 times table?

Choose one answer